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Table 1 Characteristics of the study population

From: Household mold exposure interacts with inflammation-related genetic variants on childhood asthma: a case–control study

  Asthma cases
(N = 608)
Non-asthma controls
(N = 839)
Age (y), mean (SD) 6.1 (2.0) 6.6 (2.1)
BMI, median (IQR) 15.8 (2.9) 15.7 (3.4)
Birthweight, mean (SD) 3309 (489) 3276 (507)
Gestational weeks at birth, median (IQR) 39 (2) 39 (1)
Maternal age at birth (y), mean (SD) 28.6 (3.5) 27.9 (3.9)
Maternal educational level, (n, %)   
 ≤ 9 years 40 (6.6) 138 (16.4)
10–12 years 79 (13) 151 (18)
13–16 years 395 (65) 443 (52.8)
 > 16 years 49 (8.1) 45 (5.4)
Paternal educational level, (n, %)   
 ≤ 9 years 38 (6.2) 125 (14.9)
10–12 years 74 (12.2) 153 (18.2)
13–16 years 383 (63) 437 (52.1)
 > 16 years 68 (11.2) 66 (7.9)
Gender, (n, %)   
Boy 368 (60.5) 454 (54.1)
Girl 240 (39.5) 385 (45.9)
Family history of allergy, (n, %)   
No 275 (45.2) 627 (74.7)
Yes 314 (51.6) 194 (23.1)
Delivery mode, (n, %)   
Vaginal 211 (34.7) 328 (39.1)
Caesarean section 394 (64.8) 507 (60.4)
Exclusive breastfeeding, (n, %)   
 < 6 months 301 (49.5) 426 (50.8)
 ≥ 6 months 305 (50.2) 413 (49.2)
Carpet in the dwelling, (n, %)   
No 562 (92.4) 786 (93.7)
Yes 37 (6.1) 41 (4.9)
Pet in the dwelling, (n, %)   
No 539 (88.7) 740 (88.2)
Yes 58 (9.5) 94 (11.2)
ETS at birth, (n, %)   
No 430 (70.7) 547 (65.2)
Yes 172 (28.3) 289 (34.4)
ETS at present, (n, %)   
No 421 (69.2) 521 (62.1)
Yes 178 (29.3) 312 (37.2)
Visible mold in the dwelling, (n, %)   
No 457 (75.2) 720 (85.8)
Yes 151 (24.8) 119 (14.2)
  1. SD standard deviation, IQR inter-quartile range, ETS environmental tobacco smoke